Thirty metres across, the enclosure is defined by an earthen bank and a fosse, which is a wide, shallow ditch dug to reinforce or accentuate the boundary, and an inspection carried out in 2001 concluded that it is most likely a tree-ring, a designed landscape feature rather than a defensive or agricultural structure. Tree-rings of this kind were planted as ornamental circles of trees, often on country house estates, functioning as visual punctuation in a managed landscape, providing shelter, aesthetic variety, or simply a fashionable flourish.

The earthwork sits roughly 45 metres to the north-west of Farranmacfarrell House, a structure thought to date from the 17th century, which gives some sense of the broader estate context. The 1837 Ordnance Survey six-inch map marks a wooded area at this very location, which aligns neatly with the tree-ring interpretation. By the time the 1913 edition was produced, the trees had evidently gone, and what appears instead is a subcircular hachured enclosure, the cartographic convention for an earthen bank shown in relief. That same map depicts what appears to be a field boundary curving around the enclosure at the north-west to north, suggesting the feature had by then been absorbed into the working field system. The bank itself survives unevenly: largely levelled between the north-east and south, but still standing to an external height of around 1.6 metres on the west. Outside the fosse to the north-west, there is a remnant of a second earthen bank, this one retaining traces of stone facing on its outer side.